SQL injection is a common hacking technique that manipulates database queries. It can give attackers unauthorized access to sensitive information. Despite being well-known, SQL injection remains a major web application vulnerability due to inadequate safeguards.
How It Works
Many web apps use SQL to interface with databases. Hackers can insert malicious SQL code into input fields, like search bars, to modify queries:
Normal query:
SELECT * FROM users WHERE name = 'username'
With injection:
SELECT * FROM users WHERE name = 'username' OR '1'='1'--
The injected code '1'='1'-- makes the query return all records. This tricks the app into handing over data without authentication.
Dangers of SQL Injection
Successful injection can let hackers:
- Steal personal data like credit cards or passwords
- Access and modify sensitive information
- Install malware on servers
- Perform denial of service attacks
Even huge sites like Facebook and Yahoo have fallen victim to SQL injection. The impact can be severe.
Preventing Injection Attacks
Defending against SQL injection requires:
Input validation and sanitization - filter out dangerous characters
Parameterized queries - separate data from SQL code
Minimizing database permissions
Security scanning to identify vulnerabilities
SQL injection is a sneaky and devastating attack vector. But following secure coding practices will help shut the door on injection attacks.
Top comments (0)